/usr/share/sendmail/cf/feature/prefixmod.m4 is in sendmail-cf 8.15.2-3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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#
# Copyright (c) 2014 Proofpoint, Inc. and its suppliers.
# All rights reserved.
#
# By using this file, you agree to the terms and conditions set
# forth in the LICENSE file which can be found at the top level of
# the sendmail distribution.
#
#
divert(-1)
# Arguments:
# 1: prefix to match; must be one or more tokens
# (this is not a "substring" match)
# 2: flags to set
# NYI: 3: replacement for 1 (empty for now)
ifelse(defn(`_ARG_'), `', `errprint(`Feature "prefixmod" requires argument')',
`define(`_PREFIX_MOD_', _ARG_)')
ifelse(len(X`'_ARG2_),`1', `errprint(`Feature "prefixmod" requires two arguments')',
`define(`_PREFIX_FLAGS_', _ARG2_)')
define(`_NEED_MACRO_MAP_', `1')
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